OPA2335AIDR - Dual Zero-Drift 5uV 2MHz Op Amp | TI
부품 번호: OPA2335AIDR ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $5.95 | $5.95 |
| 10 | $5.36 | $53.60 |
| 100 | $4.76 | $476.00 |
| 500 | $4.29 | $2,145.00 |
| 1,000 | $3.81 | $3,810.00 |
OPA2335AIDR 개요
A zero-drift amplifier (also called auto-zero or chopper-stabilized op-amp) is a precision amplifier topology that continuously samples and corrects its own input offset voltage, virtually eliminating the 1/f noise corner and drift over time and temperature. Within the broader taxonomy, zero-drift op-amps sit beneath precision amplifiers and instrumentation amplifiers, above general-purpose CMOS op-amps; they are critical in any signal chain where DC accuracy over temperature matters more than absolute bandwidth.
Key features include 5 uV maximum offset voltage, 0.05 uV/°C maximum drift, single-supply operation from 2.7V to 5.5V, 2 MHz GBW, rail-to-rail output, 285 uA quiescent current per channel, and a miniature SOIC-8 footprint. The chopper-stabilized topology eliminates the 1/f noise corner, producing flat noise spectral density down to DC - a feature classical CMOS op-amps cannot match.
The OPA2335 uses TI's auto-zeroing architecture that combines a main amplifier with a nulling amplifier. The nulling amplifier periodically samples the offset and applies a correction, yielding near-zero long-term drift. This makes the device particularly well suited for high-gain DC stages, sensor signal conditioning, and 16-bit-plus precision analog-to-digital converter (ADC) front ends where offset drift directly translates to system error.
Typical applications include transducer signal conditioning, electronic weighing scales (electronic balances), medical instrumentation such as ECG and patient monitors, temperature measurement (RTD and thermocouple amplifiers), and precision analog front-ends for industrial process control. In each case the OPA2335's near-zero drift preserves calibration accuracy over the full operating temperature range.
When designing with the OPA2335, observe the standard zero-drift caveat: the auto-zero clock produces small intermodulation artifacts in the kHz region that can alias into audio-frequency bands - a small post-filter or careful GBW selection mitigates this. Decouple each supply pin with a 0.1 uF ceramic capacitor placed within a few millimeters of the IC.
This page synthesizes distributor pricing, drop-in compatible alternatives in the SOIC-8 footprint, parametric comparisons with same-package peers, and practical design notes not found in the manufacturer datasheet alone.
드롭인 대체품: OPA2335AIDR — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: OPA2335AIDR (동일 폼 팩터 및 풋프린트) — 차이점: Number of Channels, Package, Amplifier Type, Bias Current, MSL Level.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
OPA2335AID
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
OPA333AIDR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
OPA2333AIDR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD8628ARTZ-REEL7
✅ 드롭인✓ 재고 있음
$1.85 / 개
데이터시트 보기 →ADA4522-2ARMZ-RL
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
OPA2335AIDR 최대 정격 & 전기적 특성
| Amplifier Type | Zero-Drift / Auto-Zero CMOS Operational Amplifier |
| Number of Channels | 2 (Dual) |
| Input Offset Voltage (max) | 5 uV |
| Offset Drift (max) | 0.05 uV/°C |
| Gain-Bandwidth Product | 2 MHz |
| Quiescent Current (per channel) | 285 uA (typ) |
| Supply Voltage (Single) | 2.7 V to 5.5 V |
| Supply Voltage (Dual) | +/-1.35 V to +/-2.75 V |
| 출력 유형 | Rail-to-Rail |
| Input Type | CMOS (high impedance) |
| 동작 온도 | -40 C to +85 C |
| 패키지 | SOIC-8 (D) 3.91 mm |
| 실장 유형 | Surface Mount |
| MSL 레벨 | 2 (260 C, 1 year) |
| RoHS 상태 | Compliant |
| Shutdown Pin | No |
OPA2335AIDR 핀 구성
| 핀 1 | OUTA — Channel A output |
| 핀 2 | INA- — Channel A inverting input |
| 핀 3 | INA+ — Channel A non-inverting input |
| 핀 4 | V- — Negative supply (ground for single-supply) |
| 핀 5 | INB+ — Channel B non-inverting input |
| 핀 6 | INB- — Channel B inverting input |
| 핀 7 | OUTB — Channel B output |
| 핀 8 | V+ — Positive supply |
일반적인 애플리케이션
OPA2335AIDR 적합 용도: 6 애플리케이션s: Electronic Weighing Scales (Strain-Gauge Front-End), Medical Instrumentation (ECG / Patient Monitor Front-End), Thermocouple and RTD Temperature Measurement, Industrial Process Control 4-20 mA Analog Input, Precision Sensor Signal Conditioning (Bridge, pH, Load Cell), Battery-Powered Test & Measurement (DMM, Bench Meter).
Electronic Weighing Scales (Strain-Gauge Front-End)
The OPA2335AIDR's 5 uV max input offset and 0.05 uV/°C max drift make it a direct fit for the high-gain instrumentation front-end of an electronic balance. A 1 kg/0.01 g resolution bridge typically produces only a few mV of full-scale signal that must be amplified 100x before the ADC. Any drift at the amplifier stage directly degrades long-term calibration accuracy. The 2 MHz GBW comfortably handles load-cell settling transients, and the rail-to-rail output drives a 16-bit SAR ADC over the full-scale 0-3.3 V range. Powering the OPA2335AIDR from the same 5 V rail as the ADC and using a 5 V reference (e.g. REF3140) keeps the supply noise contribution below 1 LSB at 16-bit resolution.
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Medical Instrumentation (ECG / Patient Monitor Front-End)
In medical ECG and patient monitor designs, the OPA2335AIDR serves as the gain stage after the instrumentation amplifier (e.g. INA128), providing DC level shifting and low-pass filtering. The 0.05 uV/°C drift is essential because diagnostic accuracy must be maintained across the patient's body-temperature range and the equipment's specified operating environment of -10 to +45 °C. With its 5 uV offset and flat 1/f-free noise density, the amplifier preserves the low-amplitude mV-range ECG signal without adding drift or 1/f noise. Single 3.3 V supply operation simplifies battery-powered designs where the OPA2335AIDR's 285 uA/channel quiescent current keeps consumption low. MRI-safe variants require additional shielding, but for bedside monitors the SOIC-8 footprint enables a compact four-layer PCB.
추천
Thermocouple and RTD Temperature Measurement
Type K, J and T thermocouples produce only tens of microvolts per °C - for a 0.1 °C resolution across 0-500 °C the amplifier must preserve microvolt-level signals without drift. The OPA2335AIDR's 0.05 uV/°C drift specification translates to less than 0.05 °C of additional error over a 0-100 °C ambient swing, which is essential for grade-A calibrators and bench multimeters. The 2 MHz GBW is more than adequate for these narrow-band DC applications, and the rail-to-rail output lets the designer use a single 5 V supply and a 24-bit delta-sigma ADC such as the ADS1220 for cold-junction compensation. The dual channel means a single SOIC-8 holds the thermocouple amplifier plus the cold-junction compensation sensor preamp, halving board area versus two single op-amps.
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Industrial Process Control 4-20 mA Analog Input
Process-control analog-input boards convert 4-20 mA current loops into 0-5 V signals via a precision sense resistor and amplifier. The OPA2335AIDR's high input impedance eliminates any loading error on the 250 Ω loop resistor, while its near-zero drift preserves the calibration across years of industrial-floor operation in 0-70 °C panels. The dual channel accepts two independent 4-20 mA inputs on a single SOIC-8, simplifying multi-channel analog-input modules. Combined with a 16-bit ADC and 5 V loop power, the amplifier error budget stays below 0.05 % of full scale. Industrial approvals (UL 508, IEC 61131-2) come from the host module certification, not from the amplifier itself, simplifying regulatory workflows.
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Precision Sensor Signal Conditioning (Bridge, pH, Load Cell)
The OPA2335AIDR excels as a precision conditioner for low-output transducers such as strain-gauge bridges, load cells, pH probes, and pressure sensors. Operating from a single 5 V supply, each channel can buffer or amplify mV-level sensor signals with negligible drift. The 285 uA quiescent current per channel is reasonable for line-powered instrumentation, and the wide 2 MHz GBW ensures transient response on mechanical events. Two channels on one SOIC-8 die provide a compact footprint for dual-sensor modules such as differential pressure or weigh-in-motion road sensors. The part also tolerates input common-mode voltage within (V+)-1.5 V, which fits typical 2.5 V-bridge sensor rails.
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Battery-Powered Test & Measurement (DMM, Bench Meter)
Bench-top digital multimeters and portable calibrators use the OPA2335AIDR as a precision gain stage on the DC voltage and resistance measurement paths. The 5 uV offset contributes negligible error at the 6.5-digit range, and the 0.05 uV/°C drift ensures that the meter's accuracy spec holds across the bench's typical 18-28 °C operating range. The single 2.7 V supply option also supports handheld meters running from a single Li-ion cell. Compared to the OPA2333AIDR, the OPA2335AIDR delivers much higher 2 MHz GBW which is essential for AC-coupled bandwidth measurements. The rail-to-rail output directly drives the meter's 24-bit ADC over the full input range, eliminating the need for a separate level shifter.
추천
추천 제품 요약
엔지니어링 참조 데이터: OPA2335AIDR — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | OPA2335AID | OPA333AIDR | OPA2333AIDR | AD8628ARTZ-REEL7 | ADA4522-2ARMZ-RL |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Analog Devices |
| Package | SOIC-8 (D) | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (D) - same | MSOP-8 - alternate |
| Architecture | Zero-Drift / Auto-Zero CMOS | Zero-Drift / Auto-Zero CMOS | Zero-Drift / Auto-Zero CMOS | Zero-Drift / Auto-Zero CMOS | Auto-Zero CMOS | Zero-Drift CMOS |
| Input Offset Voltage (max) | 5 uV | 5 uV | 15 uV | 15 uV | 5 uV | 4 uV |
| Offset Drift (max) | 0.05 uV/°C | 0.05 uV/°C | 0.05 uV/°C | 0.05 uV/°C | 0.05 uV/°C | 0.015 uV/°C |
| Gain-Bandwidth Product | 2 MHz | 2 MHz | 350 kHz | 350 kHz | 2 MHz | 5 MHz |
| Quiescent Current (per channel) | 285 uA | 285 uA | 17 uA | 17 uA | 750 uA | 830 uA |
| Supply Voltage (single) | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 2.7 V to 5.5 V | 4.5 V to 5.5 V |
| Output Swing | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail |
| Channels | 2 | 2 | 1 | 2 | 1 (AD8628 single) | 2 |
주요 차별점
- Wider 2 MHz GBW versus low-Iq zero-drift peers (vs OPA2333AIDR)
- True 5 uV offset, best-in-class within TI zero-drift family (vs OPA333AIDR (single-channel, 15 uV max))
- Cross-brand drop-in availability with same key ratings (vs AD8628ARTZ-REEL7 (Analog Devices))
설계 노트
Place a 0.1 uF X7R ceramic decoupling capacitor within 5 mm of each supply pin (pins 4 and 8) directly between the V+ pin and V- pin. Add a bulk 10 uF tantalum or electrolytic capacitor nearby for transient suppression. For sensor-front-end designs where ADC noise is critical, star-ground the V- pin back to the supply common - a shared analog/digital ground return will couple ADC switching noise into the amplifier's ground reference and degrade 16-bit accuracy.
Route the high-impedance input traces (INA+, INA-, INB+, INB-) as short as possible, surrounded by a grounded guard ring on both PCB layers. Avoid routing them parallel to digital clock lines - the OPA2335's CMOS inputs have multi-megaohm input impedance and can capacitively couple noise onto the signal. For unity-gain buffer configurations, keep the feedback resistor short and adjacent to the inverting pin to minimize stray capacitance that destabilizes the amplifier.
Estimated: when a zero-drift amplifier is used in a gain > 1000 configuration with source impedance > 5 kOhm, the auto-zero clock switching can produce RTI noise of 5-10 uV at the auto-zero clock frequency. This typically falls around 10 kHz for the OPA2335. If the design requires microvolt-level accuracy, add a single-pole RC low-pass filter at fC = 50 Hz to 1 kHz on the output. Note that this is a design estimate based on typical zero-drift behavior, not a specific datasheet figure.
The OPA2335AIDR's SOIC-8 package has a theta_JA of approximately 150 C/W, so at room temperature self-heating is negligible. Even at maximum supply (5.5 V) and short-circuit output to mid-rail, the internal thermal-shutdown limit (~150 C junction) is rarely reached. Designers running the part at extended 85 C ambient should still keep the output current below 30 mA continuous to avoid package-induced self-heating that adds drift.
규정 준수 정보
RoHS and REACH compliant per Texas Instruments product page; MSL-2 (260 C, 1 year); not AEC-Q100 qualified - use automotive grade part numbers like OPA2335AIDR-Q1 if required.
